| 英文摘要 |
The maximum observed peak ground acceleration and peak ground velocity at various stations during the 2018 Hualien, Taiwan earthquake were 594 Gal and 146 cm/s, respectively. Pulse-like velocities were observed at all stations within 4 km from the Milun Fault. The horizontal spectral accelerations of the pulse-like records indicated two obvious amplifications approximately at periods of 1.0 s and 2.0 s. Natural frequencies of 0.8 to 1.5 Hz were observed in the region near the Milun Fault using microtremor measurements. The spectral acceleration peak approximately at periods of 2.0 s is mostly seen in the east-west direction, indicating typical faultnormal seismic radiation from the fault rupture. Consequently, we contend that the amplifications of the spectral acceleration at approximately 1.0 s and 2.0 s were caused by site amplification and the rupture front, respectively. The site amplification at the 1.0 s period may have been one reason for the collapse of medium-rise buildings during this earthquake. |
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